Diagrams are thought-provoking design instruments, indispensable to those with both a philosophical inclination and the ambition to understand the conditions of the world as we experience it today. ‘Activity Diagrams’ presents the reader with an overview of the use of activity diagrams in contemporary architecture. This hefty DAMDI volume combines ‘Activity Diagrams’ with ‘Conceptual Diagrams’. As the title suggest the ‘Conceptual Diagrams’ part of the book presents the reader with a look into what could or might have been. This book combines two very successful titles into one large overview.